18226687 has 2 divisors, whose sum is σ = 18226688. Its totient is φ = 18226686.

The previous prime is 18226679. The next prime is 18226699. The reversal of 18226687 is 78662281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18226687 - 2³ = 18226679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18226627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9113343 + 9113344.

It is an arithmetic number, because the mean of its divisors is an integer number (9113344).

Almost surely, 2^18226687 is an apocalyptic number.

18226687 is a deficient number, since it is larger than the sum of its proper divisors (1).

18226687 is an equidigital number, since it uses as much as digits as its factorization.

18226687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 18226687 is about 4269.2724204482. The cubic root of 18226687 is about 263.1697160535.

The spelling of 18226687 in words is "eighteen million, two hundred twenty-six thousand, six hundred eighty-seven".